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Veterinary staff had examined him earlier in the day after being notified by keepers that he was very lethargic and had no appetite, the zoo said.

The exam, which included blood work, X-rays and an ultrasound, revealed an abnormal accumulation of fluid in his abdomen. He received intravenous fluids, antibiotics and anti-inflammatory medication, but his condition did not improve and he died several hours later, the zoo said.

“A complete set of tissues will be sent to our veterinary pathologist to determine a cause for his clinical signs and death,” said Cincinnati Zoo’s Director of Veterinary Medicine, Dr. Mark Campbell in a news release.

Life expectancy for this species is 9-10 years in the wild and slightly longer in captivity, the zoo said.